Heat the grill. Place the meat over hot coals and cook, turning once and basting with any leftover marinade during cooking, until crisp. At the same time, grill the pineapple strips, turning as needed, until lightly browned.

To assemble, chop the grilled pork into 1/4-inch pieces. Cut the pineapple into 1/2-inch pieces. Place the pork on the warmed tortillas and top with onions and cilantro and pineapple pieces. Serve with hot sauce on the side.